AP101T O-Ring and Replacement Water Filter Cartridge Kit by KleenWater Aqua-Pure AP101T Compatible O-Ring and Replacement Cartridge by KleenWater Cartridge: 2.5 x 10 Inch ~ 5 Micron ~ AP101T Compatible Replacement Cartridge by KleenWater O-Ring: Water Filter Housing Replacement O-Ring for 3M Aqua-Pure AP101T / AP102T Price Includes One Cartridge and One O-Ring High Quality, Low Cost Replacement Alternatives